3 files changed, 37 insertions, 23 deletions

diff --git a/drivers/media/video/cx25840/cx25840-audio.c b/drivers/media/video/cx25840/cx25840-audio.c
index f897c1ebd5f3..f93b5160bb4f 100644
--- a/drivers/media/video/cx25840/cx25840-audio.c
+++ b/drivers/media/video/cx25840/cx25840-audio.c
@@ -194,19 +194,34 @@ void cx25840_audio_set_path(struct i2c_client *client)
 
 static int get_volume(struct i2c_client *client)
 {
+	struct cx25840_state *state = i2c_get_clientdata(client);
+	int vol;
+
+	if (state->unmute_volume >= 0)
+		return state->unmute_volume;
+
 	/* Volume runs +18dB to -96dB in 1/2dB steps
 	 * change to fit the msp3400 -114dB to +12dB range */
 
 	/* check PATH1_VOLUME */
-	int vol = 228 - cx25840_read(client, 0x8d4);
+	vol = 228 - cx25840_read(client, 0x8d4);
 	vol = (vol / 2) + 23;
 	return vol << 9;
 }
 
 static void set_volume(struct i2c_client *client, int volume)
 {
-	/* First convert the volume to msp3400 values (0-127) */
-	int vol = volume >> 9;
+	struct cx25840_state *state = i2c_get_clientdata(client);
+	int vol;
+
+	if (state->unmute_volume >= 0) {
+		state->unmute_volume = volume;
+		return;
+	}
+
+	/* Convert the volume to msp3400 values (0-127) */
+	vol = volume >> 9;
+
 	/* now scale it up to cx25840 values
 	 * -114dB to -96dB maps to 0
 	 * this should be 19, but in my testing that was 4dB too loud */
@@ -284,30 +299,26 @@ static void set_balance(struct i2c_client *client, int balance)
 
 static int get_mute(struct i2c_client *client)
 {
-	/* check SRC1_MUTE_EN */
-	return cx25840_read(client, 0x8d3) & 0x2 ? 1 : 0;
+	struct cx25840_state *state = i2c_get_clientdata(client);
+
+	return state->unmute_volume >= 0;
 }
 
 static void set_mute(struct i2c_client *client, int mute)
 {
 	struct cx25840_state *state = i2c_get_clientdata(client);
 
-	if (state->aud_input != CX25840_AUDIO_SERIAL) {
-		/* Must turn off microcontroller in order to mute sound.
-		 * Not sure if this is the best method, but it does work.
-		 * If the microcontroller is running, then it will undo any
-		 * changes to the mute register. */
-		if (mute) {
-			/* disable microcontroller */
-			cx25840_and_or(client, 0x803, ~0x10, 0x00);
-			cx25840_write(client, 0x8d3, 0x1f);
-		} else {
-			/* enable microcontroller */
-			cx25840_and_or(client, 0x803, ~0x10, 0x10);
-		}
-	} else {
-		/* SRC1_MUTE_EN */
-		cx25840_and_or(client, 0x8d3, ~0x2, mute ? 0x02 : 0x00);
+	if (mute && state->unmute_volume == -1) {
+		int vol = get_volume(client);
+
+		set_volume(client, 0);
+		state->unmute_volume = vol;
+	}
+	else if (!mute && state->unmute_volume != -1) {
+		int vol = state->unmute_volume;
+
+		state->unmute_volume = -1;
+		set_volume(client, vol);
 	}
 }
 
diff --git a/drivers/media/video/cx25840/cx25840-core.c b/drivers/media/video/cx25840/cx25840-core.c
index 9f99007d389b..65ad7943dd9a 100644
--- a/drivers/media/video/cx25840/cx25840-core.c
+++ b/drivers/media/video/cx25840/cx25840-core.c
@@ -915,6 +915,7 @@ static int cx25840_detect_client(struct i2c_adapter *adapter, int address,
 	state->audclk_freq = 48000;
 	state->pvr150_workaround = 0;
 	state->audmode = V4L2_TUNER_MODE_LANG1;
+	state->unmute_volume = -1;
 	state->vbi_line_offset = 8;
 	state->id = id;
 	state->rev = device_id;
@@ -1066,9 +1067,10 @@ static void log_audio_status(struct i2c_client *client)
 	}
 	v4l_info(client, "Detected audio standard:   %s\n", p);
 	v4l_info(client, "Audio muted:               %s\n",
-		    (mute_ctl & 0x2) ? "yes" : "no");
+		    (state->unmute_volume >= 0) ? "yes" : "no");
 	v4l_info(client, "Audio microcontroller:     %s\n",
-		    (download_ctl & 0x10) ? "running" : "stopped");
+		    (download_ctl & 0x10) ?
+				((mute_ctl & 0x2) ? "detecting" : "running") : "stopped");
 
 	switch (audio_config >> 4) {
 	case 0x00: p = "undefined"; break;
diff --git a/drivers/media/video/cx25840/cx25840-core.h b/drivers/media/video/cx25840/cx25840-core.h
index 8c1fbd9b87c1..86e2edfc4941 100644
--- a/drivers/media/video/cx25840/cx25840-core.h
+++ b/drivers/media/video/cx25840/cx25840-core.h
@@ -42,6 +42,7 @@ struct cx25840_state {
 	enum cx25840_audio_input aud_input;
 	u32 audclk_freq;
 	int audmode;
+	int unmute_volume; /* -1 if not muted */
 	int vbi_line_offset;
 	u32 id;
 	u32 rev;